I Am a Screw Up

Once again, I have ruined things with someone I care about. Here's what has happened:
We met at the hospital a few months ago (he was security and I am a crisis specialist) and have been talking ever since. He has had a gf within the time period we have known each other (now he is single again), but I have not dated anyone.
This weekend, I went to see an air show (Blue Angels) and kind of tried to get him to go with me. Jokingly, I stated that I would get to see all these sexy men in uniform. He stopped talking. After the air show, I asked him what was wrong and he said nothing. Later, I invited him over to my place for Wednesday night and he said that he would if I didn't have someone else. I told him that of course I didn't, and that there was a guy I like and care about, that guy being him. He has not talked to me since I told him that I like him. I don't know what to do with him. I really like him and thought he would realize that I was joking. He knows I find him very attractive. I'm afraid I've hurt our potential past the point of repair.